The Sulphur-bellied Warbler (Phylloscopus griseolus), is a species of leaf warbler found in the Palearctic region. The species was previously known by the name of Olivaceous Leaf-warbler. They are found on rocky hill and scrub forest habitats.
The species is found in small groups and has a tendency to forage low in the vegetation sometimes even hopping on the ground. Like other leaf-warblers it gleans insects from small branches and leaves. They have a single note cheep call.